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-   -   Hard top defroster....help? (http://www.peachparts.com/shopforum/mercedes-benz-sl-discussion-forum/210544-hard-top-defroster-help.html)

pwrslider 01-12-2008 03:36 AM

Hard top defroster....help?
 
I just picked up a hard top for my 72 350SL.....it has the cable plug that fits into the side plug.....but the rear window doesn't have those tell-tale wires in the glass that a normal defroster has..... When I hit the defrost button on the dash...nothing really happens.

1. Do I actually have a defroster....with no wires in the glass?

2. How come it don't work?

3. Should I just continue to use my manual defroster....(hand and a rag??)_

any help would be great.
thanks

Philoprof 01-12-2008 10:24 AM

SL Defroster
 
Quote:

Originally Posted by pwrslider (Post 1729952)
I just picked up a hard top for my 72 350SL.....it has the cable plug that fits into the side plug.....but the rear window doesn't have those tell-tale wires in the glass that a normal defroster has..... When I hit the defrost button on the dash...nothing really happens.

1. Do I actually have a defroster....with no wires in the glass?

2. How come it don't work?

3. Should I just continue to use my manual defroster....(hand and a rag??)_

any help would be great.
thanks

The hard top of my 380sl doesn't have any visible wires in it either, and it always worked fine. When I put it on last winter, however, it wasn't working, even though there was power to it. (You can use a multi-tester to see if your plug is energized.)

The only alternative, I guess, is to get one of the universal grids that JC Whitney sells, though it won't be as transparent as the original.

Please let me know if you find out what the problem is.

Good luck,

Bill

dpetryk 01-13-2008 08:45 AM

Look really close at the glass. There are small wires embedded inside the glass not on the surface like most. Hard to see. It "dont work" because it is not getting electricity. It could be a number of things like fuses, wires, relays, connectors and everything in between.

Philoprof 01-14-2008 07:48 AM

It's easy to check: turn it on and put the leads of a multi-tester into the defroster plug socket. If you've got juice, there's a short in the grid. You can then test the grid's continuity by putting one multi-tester lead on each of the plug's prongs and passing current through it. No current, no continuity.

Bill

pwrslider 01-15-2008 11:38 PM

Thanks!!

It looks like I got juice.....It just takes the grids 15-20 minutes to warm up the glass....

is this normal for the year....1972?

dpetryk 01-16-2008 11:03 AM

How cold is it? The colder it is the longer it will take to melt the frost.

pwrslider 01-17-2008 12:19 AM

not that cold....I'm in Ca. so we dont really even get frost...just heavy fog...... it's more of a condensation problem....

ScottinSoCal 01-17-2008 07:40 AM

Quote:

Originally Posted by pwrslider (Post 1734849)
not that cold....I'm in Ca. so we dont really even get frost...just heavy fog...... it's more of a condensation problem....

Water condensation is going to take longer than ice. I'd say that's normal. I'm right on the coast and all my newer cars take that long to evaporate the fog off the windows in the morning. I was in New York state before Christmas and melting the ice off took less than 5 minutes.

I never have the hard top on my SL, so I don't know how long that one takes.


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